function Map(el)
{
    this.el=el
    this.width=800
    this.height=400
    this.init()
}
Map.prototype.init=function(){
    this.el.style.background='url(./bg.png)'
    this.el.style.width=this.width+'px'
    this.el.style.height=this.height+'px'
    this.el.style.border='10px solid green'
    this.el.style.position='relative'

}